Install this version:
emerge -a =dev-haskell/megaparsec-9.2.1If this version is masked, you can unmask it using the autounmask tool or standard emerge options:
autounmask =dev-haskell/megaparsec-9.2.1Or alternatively:
emerge --autounmask-write -a =dev-haskell/megaparsec-9.2.1# Copyright 1999-2022 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI=8
# ebuild generated by hackport 0.7.1.2.9999
#hackport: flags: -dev
CABAL_FEATURES="lib profile haddock hoogle hscolour"
inherit haskell-cabal
DESCRIPTION="Monadic parser combinators"
HOMEPAGE="https://github.com/mrkkrp/megaparsec"
LICENSE="BSD-2"
SLOT="0/${PV}"
KEYWORDS="~amd64 ~x86"
RDEPEND=">=dev-haskell/case-insensitive-1.2:=[profile?] <dev-haskell/case-insensitive-1.3:=[profile?]
>=dev-haskell/parser-combinators-1.0:=[profile?] <dev-haskell/parser-combinators-2.0:=[profile?]
>=dev-haskell/scientific-0.3.7:=[profile?] <dev-haskell/scientific-0.4:=[profile?]
>=dev-lang/ghc-8.8.1:=
"
DEPEND="${RDEPEND}
>=dev-haskell/cabal-3.0.0.0
"
src_configure() {
haskell-cabal_src_configure \
--flag=-dev
}
>=dev-haskell/case-insensitive-1.2:=[profile?] <dev-haskell/case-insensitive-1.3:=[profile?] >=dev-haskell/parser-combinators-1.0:=[profile?] <dev-haskell/parser-combinators-2.0:=[profile?] >=dev-haskell/scientific-0.3.7:=[profile?] <dev-haskell/scientific-0.4:=[profile?] >=dev-lang/ghc-8.8.1:= >=dev-haskell/cabal-3.0.0.0
>=dev-haskell/case-insensitive-1.2:=[profile?] <dev-haskell/case-insensitive-1.3:=[profile?] >=dev-haskell/parser-combinators-1.0:=[profile?] <dev-haskell/parser-combinators-2.0:=[profile?] >=dev-haskell/scientific-0.3.7:=[profile?] <dev-haskell/scientific-0.4:=[profile?] >=dev-lang/ghc-8.8.1:=